CN1336552A - Method for detecting failure welding of IC terminal by using resonating type sensor coil - Google Patents
Method for detecting failure welding of IC terminal by using resonating type sensor coil Download PDFInfo
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- CN1336552A CN1336552A CN 01122074 CN01122074A CN1336552A CN 1336552 A CN1336552 A CN 1336552A CN 01122074 CN01122074 CN 01122074 CN 01122074 A CN01122074 A CN 01122074A CN 1336552 A CN1336552 A CN 1336552A
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Abstract
The invention electrically detects the soldering of an IC terminal at a high speed. A tuning type sensor coil provided with a sensor coil formed by winding a plurality of conductive coils on a cylindrical bobbin formed of a magnetic material core such as ferrite or the like having a diameter conformed to the outer dimension of an IC and a capacitor connected to the output end of the sensor coil, is set on the IC. A means for applying an AC (sine wave, pulse, etc.), signal to a measuring terminal in the IC grounded except the measuring terminal to detect the magnetic field generated by the current carried to a protective diode within the IC by the tuning type sensor coil set on the IC is given to all the IC terminals. The propriety is judged by the comparison with a preliminarily stored reference value for non-defective IC.
Description
The present invention relates to be equipped with on a kind of electric high speed detection tellite the whether good detection method of welding of IC terminal.
And whether the welding that also can detect nothing lead-in wire IC such as BGA is good.
As the whether good method of the IC wire bonds that detects prior art, disclose among the Te Kaiping 6-34714 and a kind ofly be arranged on the sheet metal on IC top and the electrostatic capacitance value between the IC lead frame by the figure detecting on the printed circuit board (PCB), by electrostatic capacitance value and certified products are compared, detect the bad method of wire bonds.
Te Kaiping 10-19958 then discloses limit heating entire I C, and the limit is by being located at the protection diode drop V of each terminal inside of IC before and after the printed circuit prototypes observation heating
FTemperature variation, by temperature variation and certified products are compared, detect the whether good method of welding.
According to the whether good detection method of the welding of above-mentioned prior art, many problems that existence will solve.For example, the welding detection method that the spy opens flat 6-34714 is difficult to IC (BGA etc.) at no lead frame and goes up and use, and whether good the spy open welding the detection method of flat 10-19958, and heat time heating time is long, therefore measures the time lengthening of judging.
The present invention makes invention for the shortcoming that solves above-mentioned prior art; make electric current flow to the protection diode of being located at each terminal inside of IC from the figure of printed circuit board (PCB); and by the tuning type cell winding with the resonant circuit that is configured in IC top the magnetic field that described electric current takes place is detected, compare by reference value whether detect welding good with certified products.Promptly, add interchange (sine wave, pulse etc.) signal for the figure that connects on the printed circuit board (PCB) of checking the IC terminal on the object IC, the electric current that IC is not had degree of fatigue in the IC internal flow, by having the tuning type cell winding of the resonant circuit of being located at IC top, detect with electric current and flow through the inner magnetic field that takes place of IC.At this moment, only give the IC terminal feeding electric current of determination object, other the whole ground connection of IC terminal.After signal that will be corresponding with the magnetic field intensity that is detected amplifies, carry out detection, be transformed into DC voltage level, the reference value with the certified products of storing in advance compares again, if measured value is littler than the reference value of certified products, then being judged as the IC terminal does not have correctly to weld with the figure of printed circuit board (PCB).Move the determination object terminal successively and continue to measure, carry out the inspection of the whole terminals of IC.
For detecting with electric current, high-level efficiency flows through the inner magnetic field that generates of IC, the plane 1 circle coil of tabular current-carrying plate formation or the sensor plate coil of spiral fashion winding around with planar dimension corresponding with IC physical dimension, be installed to the tuning type cell winding that has resonant circuit below, 2 coil electricity are connected in series and make it become same polarity, to improve magnetic detection sensitivity.
Fig. 1 is the expression magnetic field of measuring the IC internal current with the tuning type cell winding that possesses tank circuit with the key diagram of the method that detects bad welding.
The circuit that Fig. 2 represents to possess the tuning type cell winding of tank circuit constitutes block diagram.
The circuit that Fig. 3 represents to possess the tuning type cell winding of series resonant circuit constitutes block diagram.
Fig. 4 is for combining tuning type cell winding the key diagram that magnetic sensitivity is improved with the sensor plate coil.
Below, the limit is with reference to the accompanying drawing limit explanation detection method that detects failure welding on the IC terminal according to cell winding of the present invention.
Fig. 1 represents with the key diagram of the tuning type cell winding that has tank circuit according to the method in the amperometric determination magnetic field of flowing through IC inside.Be provided with tuning type cell winding in the IC3 top that has a plurality of terminals.The figure that exchanges on the printed circuit board (PCB) of (sine wave, pulse etc.) signal source 12 and the determination object terminal 4 that is connected with IC3 is connected, and other terminal all is connected with power supply or the GND terminal 5 of IC.
Therefore, flow to the electric current of IC inside by determination object terminal 4, be formed into the loop of IC terminal 5 (power supply or GND terminal) via the protection diode of adorning in the IC from ac signal which 12.
The electric current of being supplied with determination object terminals 4 by ac signal which 12 is to the Weak current of the unlikely generation degree of fatigue of IC, be no more than usually ± 20mA～± value of 50mA, and be electric current below put down in writing in the tables of data of device absolute maximum rated.
Tuning type cell winding 1 is the tuning type cell winding that possesses tank circuit, promptly on the bobbin that constitutes by magnetic material cores bodies such as ferrite, twine multi-turn electric conductivity coil and forms the coiled type sensor with diameter corresponding with IC physical dimension, and then be connected in parallel at coiled type sensor two ends capacitor 11 and formation.
Fig. 2 is the formation block diagram that is expressed as the testing circuit that has the tuning type cell winding that possesses tank circuit.
If the frequency of ac signal which 12 is 128KHz, for the inner tuning acquisition highest detection of the field frequency sensitivity that takes place of IC, then the constant of tank circuit 13 is: coil turn is 464, condenser capacity is 300pF.
The detection signal of tank circuit 13 amplifies with amplifier 6, and by the detection of direct current wave detector, its DC voltage level becomes several 100mV.In addition, the constant of the frequency of above-mentioned ac signal which and tank circuit also can suitably be selected.
The output of direct current wave detector 14 compares with the certified products reference value 15 of storage in advance in the portion of comparing to determine 16, carries out bad judgement.
Fig. 3 is the formation block diagram that expression attaches the testing circuit of the tuning type cell winding that possesses series resonant circuit.One end of tuning type cell winding 1 be connected in series capacitor 11 ' formation series resonant circuit 13 '.If the frequency of ac signal which 12 is 128KHz, then for the inner tuning acquisition highest detection of the field frequency sensitivity that takes place of IC, then series resonant circuit 13 ' constant be: coil turn is 280, series capacitor 11 ' capacity be 51pF.
As mentioned above, the magnetic field that produces can make the size of bobbin corresponding with the physical dimension of IC for high-level efficiency detects the electric current that flows through IC protection diode.
But, according to model and application target, the profile of IC has of all kinds, so for corresponding with IC respectively, need to prepare many tuning type cell windings.So not only take time and expense, and also be worthless produce in batches reducing price.
Therefore, make sensor plate coil, so that just can be corresponding with the IC of various sizes with the tuning type cell winding of same size with planar dimension corresponding with IC physical dimension.
Fig. 4 is illustrated in and flat sensor plate coil 2 is installed below the tuning type cell winding 1, and carries out electricity and be connected in series, and makes 2 coils become the key diagram of the state of same polarity.
The size of the sensor plate coil 2 that is made of current-carrying plates such as copper is corresponding with the physical dimension of IC3, and the middle body of tabular current-carrying plate is drilled to circle, and cuts off the dull and stereotyped gap that forms between the circle that is drilled to and dull and stereotyped one side, makes it form a circle coil.
Owing to make tuning type cell winding 1 and sensor plate coil 2 become same polarity by being connected in series, so use 2 coils just can improve the detection sensitivity in magnetic field.
Though sensor plate coil a slice also can, can improve detection sensitivity by multi-disc is overlapping, thereby utilize the printed circuit board (PCB) of two sides Copper Foil, just can be easy to make 2 overlapping planar coils.
As above theory is crossed, if adopt the detection method of failure welding of the present invention, use the tuning type cell winding that has resonant circuit, assay method is just simple, can carry out high speed inspection in the required time of number ms/ terminal.
For the different IC of physical dimension, make respectively and IC physical dimension corresponding sensor plate coil, as long as the tuning type cell winding of a kind of size is installed, just can realize the detection method of stable measurement and differentiation above that.
Claims (2)
1, the tuning type cell winding of a kind of usefulness detects the detection method of failure welding on the IC terminal, is the detection method of the failure welding of the IC terminal installed on the printed circuit board (PCB), it is characterized in that:
The tuning type cell winding have tank circuit or series resonant circuit is set on IC top, and described tank circuit or series resonant circuit are connected in parallel capacitor or are connected in series to by the cell winding output terminal with winding multiturn electric conductivity coil on the bobbin that the diameter magnetic material cores bodies such as ferrite corresponding with IC physical dimension constitute and form; Add interchange (sine wave, pulse etc.) signal for simultaneously the figure of the printed circuit board (PCB) of this determination object terminal that connects IC, make the inner formed protection diode of the above-mentioned IC of current direction and generate magnetic field,
By the amplifier that is connected with tuning type cell winding, amplify and the corresponding signal of measuring by the above-mentioned tuning type cell winding that is arranged at IC top of magnetic field intensity, and then by in order to judge that the DC voltage level after whether good welding device with detection compares with the reference value that stores certified products in advance, implements whole IC terminals and judges.
2, the tuning type cell winding of usefulness according to claim 1 detects the detection method of failure welding on the IC terminal, it is characterized in that sensor installation plate coil below tuning type cell winding, the tabular current-carrying plate with planar dimension corresponding with IC physical dimension is formed plane 1 circle coil with described sensor plate coil or the spiral fashion winding around forms; In that being connected in series, above-mentioned 2 coil electrics make above-mentioned tuning type cell winding and sensor plate coil become same polarity, on the output terminal of formed coil, be connected in parallel or be connected in series to capacitor, thereby form tank circuit or series resonant circuit.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000163075A JP2001340199A (en) | 2000-05-31 | 2000-05-31 | Cup tray and cup |
| JP163075/2000 | 2000-05-31 | ||
| JP217581/2000 | 2000-07-18 | ||
| JP2000217581A JP2002055140A (en) | 2000-05-31 | 2000-07-18 | Method for detecting soldering failure in ic terminal by tuning type sensor coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1336552A true CN1336552A (en) | 2002-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01122074 Pending CN1336552A (en) | 2000-05-31 | 2001-05-31 | Method for detecting failure welding of IC terminal by using resonating type sensor coil |
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| CN (1) | CN1336552A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101768A (en) * | 2013-04-14 | 2014-10-15 | 英飞凌科技股份有限公司 | Detection of current change in an integrated circuit |
| CN107087424A (en) * | 2014-10-28 | 2017-08-22 | 霍斯特塞德尔两合公司 | Position sensor, position-measurement device and the driving method for it |
| CN107799933A (en) * | 2016-09-07 | 2018-03-13 | 日本压着端子制造株式会社 | Arrangements of electric connection and arrangements of electric connection inspection instrument |
| CN109975687A (en) * | 2019-03-14 | 2019-07-05 | 大族激光科技产业集团股份有限公司 | A kind of quality detection device and method based on IC bonding wire |
| CN118090889A (en) * | 2024-04-22 | 2024-05-28 | 冰零智能科技(常州)有限公司 | Detection method and detection system for welding quality of terminal winding |
-
2001
- 2001-05-31 CN CN 01122074 patent/CN1336552A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101768A (en) * | 2013-04-14 | 2014-10-15 | 英飞凌科技股份有限公司 | Detection of current change in an integrated circuit |
| CN107087424A (en) * | 2014-10-28 | 2017-08-22 | 霍斯特塞德尔两合公司 | Position sensor, position-measurement device and the driving method for it |
| US10564009B2 (en) | 2014-10-28 | 2020-02-18 | Horst Siedle Gmbh & Co. Kg | Position sensor, position measuring device and method for the operation thereof |
| CN107087424B (en) * | 2014-10-28 | 2020-06-05 | 霍斯特塞德尔两合公司 | Position sensor, position measuring device, and driving method therefor |
| CN107799933A (en) * | 2016-09-07 | 2018-03-13 | 日本压着端子制造株式会社 | Arrangements of electric connection and arrangements of electric connection inspection instrument |
| CN107799933B (en) * | 2016-09-07 | 2019-06-14 | 日本压着端子制造株式会社 | Arrangements of electric connection and arrangements of electric connection inspection tool |
| CN109975687A (en) * | 2019-03-14 | 2019-07-05 | 大族激光科技产业集团股份有限公司 | A kind of quality detection device and method based on IC bonding wire |
| CN109975687B (en) * | 2019-03-14 | 2022-07-08 | 深圳市大族封测科技股份有限公司 | Quality detection device and method based on IC bonding lead |
| CN118090889A (en) * | 2024-04-22 | 2024-05-28 | 冰零智能科技(常州)有限公司 | Detection method and detection system for welding quality of terminal winding |
| CN118090889B (en) * | 2024-04-22 | 2024-07-23 | 冰零智能科技(常州)有限公司 | Detection method and detection system for welding quality of terminal winding |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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